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Gutiérrez-Martín D, Varela A, Hernando M, Torres-Pardo A, Matesanz E, Gómez-Recio I, González-Calbet JM, Fernández-Díaz MT, Calvino JJ, Cauqui MA, Yeste MP, Parras M. Exploring Reversible Redox Behavior in the 6H-BaFeO 3-δ (0 < δ < 0.4) System: Impact of Fe 3+/Fe 4+ Ratio on CO Oxidation. Inorg Chem 2024; 63:8908-8918. [PMID: 38684934 PMCID: PMC11094785 DOI: 10.1021/acs.inorgchem.4c00917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 04/17/2024] [Accepted: 04/19/2024] [Indexed: 05/02/2024]
Abstract
This work is devoted to evaluating the relationship between the oxygen content and catalytic activity in the CO oxidation process of the 6H-type BaFeO3-δ system. Strong evidence is provided about the improvement of catalytic performance with increasing Fe average oxidation state, thus suggesting the involvement of lattice oxygen in the catalytic process. The compositional and structural changes taking place in both the anionic and cationic sublattices of the catalysts during redox cycles have been determined by temperature-resolved neutron diffraction. The obtained results evidence a structural transition from hexagonal (P63/mmc) to orthorhombic (Cmcm) symmetry. This transition is linked to octahedra distortion when the Fe3+ concentration exceeds 40% (δ values higher than 0.2). The topotactical character of the redox process is maintained in the δ range 0 < δ < 0.4. This suggests that the cationic framework is only subjected to slight structural modifications during the oxygen exchange process occurring during the catalytic cycle.
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Affiliation(s)
- D. Gutiérrez-Martín
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - A. Varela
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - M. Hernando
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - A. Torres-Pardo
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - E. Matesanz
- Unidad
de Difracción de Rayos X. Centro de Asistencia a la Investigación
de Técnicas Químicas, Universidad
Complutense de Madrid, 28040 Madrid, Spain
| | - I. Gómez-Recio
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | - J. M. González-Calbet
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
| | | | - J. J. Calvino
- Departamento
de Ciencia de los Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Spain
| | - M. A. Cauqui
- Departamento
de Ciencia de los Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Spain
| | - M. P. Yeste
- Departamento
de Ciencia de los Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, 11510 Puerto Real, Spain
| | - M. Parras
- Departamento
de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain
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Berezhnaya MV, Perov NS, Almjasheva OV, Mittova VO, Nguyen AT, Mittova IY, Druzhinina LV, Alekhina YA. Synthesis and Magnetic Properties of Barium-Doped Nanocrystal Lanthanum Orthoferrite. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219030198] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Plyasova LM, Kardash TY. In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts. J STRUCT CHEM+ 2013. [DOI: 10.1134/s0022476612070104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Structural features of the formation of La1−x Ca x FeO3−δ (0 ≤x ≤ 0.7) hetero valent solid solutions. J STRUCT CHEM+ 2010. [DOI: 10.1007/s10947-010-0135-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nadeev AN, Tsybulya SV, Shmakov AN, Kryukova GN, Yakovleva IS, Isupova LA. High-temperature studies of La1−x SrxFeO3−δ solid solutions using synchrotron radiation. J STRUCT CHEM+ 2007. [DOI: 10.1007/s10947-007-0177-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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